JPS62157933A - Disk controller - Google Patents

Abstract

PURPOSE:To connect various disk drives and further increase the number of disk drives without modifying a programs by reading disk characteristic information and parameter information and rewriting catalog information in the program. CONSTITUTION:A disk controller 2 consists of a parameter controller 2-2 and a disk controller 2-1. Then, the disk controller 2-1 operates by the instruction of a data readout signal from a host system 3 and further a data write signal based on the disk parameter information stored in the parameter controller 2-2 to access a disk drive 1. The disk characteristic information and parameter information which are stored in fixed format on the track '0' and cylinder '0' of the disk drive previously are read out and set at the time of initialization and the catalog information in an OS program is also rewritten. Consequently, various disk drives are connected and also increase in number without modifying programs of the OS.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disk device, and particularly to a disk control device that accesses disks of various write formats.

[Conventional technology]

An auxiliary storage device is generally connected to an electronic computer, a microcomputer, or the like. The auxiliary storage device is a device that stores programs and data of a capacity that cannot be stored in the computer main body, and stores the aforementioned programs and data even when the power is turned off. After the power of the computer is turned on, necessary programs and the like are read out and executed. For example, when the computer is powered on, the computer executes the initial program loader (stored in the computer's ROM), reads the operating system (O8) execution program from the disk device, and loads it into memory. and start up the system. After the system is set up, the disk device storing the aforementioned O3 and other disk devices are controlled by the operator's operations based on the disk device characteristic information and control information registered in advance in the O8. Driven by program execution. The disk device operates according to the characteristic information and control information described above.

Conventionally, as mentioned above, the initial program loader and O
Since characteristic information of the disk device and the like are fixed in advance in 8, information written in other formats, for example, cannot be read out as is. For example, in a free disk drive, the state is determined when the diskette is formatted, and the catalog information is stored on a diskette with a format different from the format set in advance in the O8. OST:i cannot sell programs, data, etc.

Furthermore, the same problem occurs not only when a floppy disk device is connected but also when an unspecified disk device is connected. For example, in a disk device in which multiple hard disks rotate on the same axis and can be accessed simultaneously by multiple heads, depending on the model, the number of data heads, the number of cylinders per volume, the number of tracks per cylinder, and the number of sectors per track depend on the model. , Hyde number of one sector, etc.
There are many variations, each with its f
i-news is different. For this reason, as described above, it is not possible to read or write to disk devices with different characteristics using the same O8 or the like. Furthermore, it was not possible to add more disk devices without rewriting the catalog information held by O8 and the like.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional art, it is an object of the present invention to provide a disk control device that enables connection and expansion of various disk devices without modifying programs such as the initial program loader and O8 of a computer system. .

[Key points of the invention]

In order to achieve the above object, the present invention provides a disk having disk information for driving the disk stored in a specific format in a specific area, a disk information reading means for reading the disk information, and a disk information reading means for reading the disk information. catalog information storage means for storing connected disk information; comparison means for comparing the disk information stored in the catalog information storage means with the disk information read by the disk information reading means; and the comparison means. The present invention is characterized by comprising a control means for controlling to advance the disc information stored by the catalog information recording 1, 0 means or to store new disc information.

And its action is as follows.

Before driving the disk device, the disk information reading means reads out disk information stored in a specific area of the disk in a specific format. Then, the comparison means compares the read disc information with disc information previously stored in the catalog information storage means, and based on the comparison result, the control means controls the catalog information record 4. a) Advance the disc information stored in the storage means, or store new disc information.

〔Example〕

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a circuit diagram of an embodiment of the present invention.

The disk device 1 is connected to a disk controller 2-1 in a disk control device 2. The disk control device 2 includes a parameter control device 2-2 and a disk controller 2-
1, the disk controller 2-1 operates based on the disk parameter information stored in the parameter control device 2-2 in response to instructions from a data read signal and a data write signal from the host system 3. access. Note that the parameter control device 2
-2 is configured such that a predetermined value is initially set as disk parameter information, for example, when the power is turned on. Input/output control device 3-3, control information register 3-
CP tJ3-], a control information register 3-4, and an input/output control device 3-3 are connected to the main storage device 3-2.

The CPU 1-1 executes, for example, a program loaded into the main storage device 3-2, and performs controls such as outputting data to other devices (not shown), printing data to a printer, etc. When the CPU 3-1 accesses the disk device 1 to read and write data etc. in the above-mentioned program, the CPU 3-1 reads the disk characteristic information stored in the control information register 3-4 and checks the disk characteristic information. In response to the information, the input/output control device 3-3 further accesses the disk device 1 via the disk control word W2.

Although not shown, the host system 3 has an initial program loader in the main storage device 3-2, and reads a program such as O8 from the disk device I and executes it at startup.

In the embodiment of the present invention, before loading and executing a program such as the OS, the program loader first loads disk characteristic information and disk parameter information provided in a specific area (0 cylinder, O trunk) of the disk device 1 in advance. is not read.

Then, the read disk parameter information is set in the parameter control device of the disk control section 2, and characteristic information is set in the disk control information M area. Furthermore, it compares whether the characteristic information set in the disk control information area and the catalog information previously set in the OS are the same, and if they do not match, the catalog information is updated.

FIG. 2 is an information area format diagram showing the contents of disk characteristic information and disk parameter information stored in advance in the O cylinder and the O trunk. Disk characteristic information is the number of cylinders per volume CYL/
VOL, number of tracks per cylinder T R/CY
L, number of sectors per track SEC/TR, number of bytes per sector BYTE/SEC, and number of blocks usable by the user TOT A T-r3 L O
It consists of data that does not represent CK, and is stored in the 0 cylinder, o track area DC■. The step pulse value specific to the disk device, the presence or absence of error checking and correcting ECC, the number of data heads, the number of cylinders, the write power supply reduction cylinder number, and the write phase correction cylinder number are B. -It is stored in B11. In addition, B2~
B4 is not used and is a spare area.

Disk characteristic information and disk parameter information are written in the 0 cylinder and o trunk of the disk device 1 in a predetermined format, and the disk parameter information and the disk parameter information set in the parameter control device 2-2 described above when the power is turned on are written. The disk characteristic information of the disk device set in the program loader is set so that information written in the aforementioned predetermined format of the O track and 0 cylinder of the disk device 1 can be read.

FIG. 3 is a detailed flowchart of an embodiment of the invention. Processing starts when the power is turned on (START). First, characteristic information and parameter information are read from the system area (0 track, 0 cylinder) in the disk (sl). As mentioned above, this reading is performed using the o-trunk,
This is done by accessing cylinder 0, and since it is stored in a specific format, it can be read out without depending on the OS or the like. Incidentally, if a plurality of disk devices and disk control units 2 are connected, the process is performed for the number of connected disk devices. Then, this read parameter information is set for each disk control device (S
2). In the embodiment of the present invention shown in FIG. 1, only one set of disk device 1 and disk control section 2 are connected, but the same holds true even if a plurality of disk devices 1 and disk control section 2 are connected. That is, the process S2 is a process for setting the parameter information read from the 0 track and 0 cylinder of the disk device into the disk control unit 2 of the disk device from which it was read, and is repeated the number of times it is read. The disk control unit 2 has a parameter control device 2-2, and the setting in the above-mentioned process S2 is a process of setting this parameter control device 2-2 with parameter information. Control over operation becomes possible. After processing S2, the characteristic information is stored in the disk control information area, that is, the control information register 3-4 of the host system 3.
Processing S3 is performed to set the characteristic information of the disc.

Similarly, in this process S3, when a plurality of devices are connected, a process is performed to set the number of devices corresponding to the number of connected devices.

In this process S3, access to the disk device 1 becomes possible. On the other hand, the OS program of the host system 3 stores catalog information. Catalog information is information that indicates how many disk devices and disk control units 2 are connected, and this catalog information allows the OS to
The program determines how many disk devices can be accessed and accesses them. For this reason, in the embodiment of the present invention, after the process S, it is determined whether or not the read characteristic information matches the catalog information in the OS program.
4L, -f& is not performed (inconsistency), disk base reallocation and catalog information update processing S5 are performed. Then, the process is ended (END). Further, when it is determined in the discrimination process S4 that there is a match, the process S5 is skipped and the process ends. In the above-described determination process S4, the characteristic information read from each disk device and stored in the control information register 3-4 is compared with the catalog information in the OS program, and if they do not match, the disk space is reallocated and the catalog information is updated in process S5. is being carried out.

In the determination process S4, when they do not match, there is a case where the connection of the disk device has changed (when it has been replaced with another disk device) or when a new disk device has been added.

At this time, of course, the catalog information set in the OS must be written down. This rewriting process is performed in process S5.

Through the process described above, even if the disk information of the currently connected disk devices changes, the catalog information for those disk devices will be rewritten, so when the OS program runs, all the connected disk devices will be updated to the OS program. Controlled by the management of

〔Effect of the invention〕

As described above, at the time of initial setting, the present invention reads out and sets the disk characteristic information and parameter information stored in advance in the O track and O cylinder of the disk device in a specific format, and also sets the disk characteristics information and parameter information stored in the catalog in the OS program. Since information is also rewritten, according to the invention, a disk control device can be obtained that allows connection and further expansion of various disk devices without modifying programs such as the initial program loader and O3 of the computer.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, FIG. 2 is an information area format diagram, and FIG. 3 is a detailed operational flowchart of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Disk device, 2... Disk control device, 2-1... Disk controller, 2-2... Parameter control device, 3... Host system, 3-1... CPU. 3-2... Main storage device, 3-3... Input/output control device, 3-4... Control information register. Patent Applicant: Casio Computer Co., Ltd. Large d of the present invention←Shiori's words Ikita0-Operation flow route Figure 3

Claims (1)

[Scope of Claims] 1) A disk having disk information for driving the disk stored in a specific format in a specific area and a disk information reading means for reading the disk information are connected in advance. a catalog information storage means for storing disc information; a comparison means for comparing the disc information stored in the catalog information storage means with the disc information read by the disc information reading means; and a result of the comparison means is added. . A disk control device comprising: control means for advancing disk information stored in the catalog information storage means or for controlling new disk information to be stored. 2) The disk control device according to claim 1, wherein the specific area of the disk is 0 track and 0 sector of the disk.